Mueller in recent months has interviewed multiple people linked to Stone, a former Trump campaign adviser. Some of those people have also testified before the grand jury.

“I am highly confident Mr. Manafort is aware of no wrong doing on my part during the 2016 campaign, or at any other time, and therefore there is no wrongdoing to know about,” Stone told ABC News. “Narratives to the contrary by some in the media are false and defamatory.”

Manafort and his lawyers have visited Mueller’s office at least nine times in the last four weeks, CNN reported on Wednesday.